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Introduction 7xxx aluminum alloys are used extensively in aerospace and automotive industries for their high strength and significant natural aging properties [1].
Friction stir welding (FSW) is a new solid phase joining technique using a rotary welding tool to introduce the frictional heat and achieve joining, which has advantages of better mechanical properties, less distortion, and fewer weld defects than conventional fusion welding.
Generally, the resulting FSW joint consists of various zones with different microstructures and properties (for instance, mechanical properties and corrosion resistance) depending on the degree of thermal cycling and plastic deformation suffered during welding.
The SZ is affected by mechanical stirring and welding thermal cycle, and the precipitates were dissolved into the Al matrix (Fig. 5b) .
The main conclusions can be drawn: 1) The results of IGC resistance of the four zone in 7N01-T5 aluminum alloy joint can be sorted in the following order: SZ ≈BM > TMAZ > HAZ. 2) The characteristics of precipitates on grain boundary are the key factors affecting corrosion resistance of the joint.

The landform, climate and groundwater and other factors have significant influence on the formation of saline soil.
Climate Climate is one of the main factors influenced soil salinization, because it directly affects the soil salt movement station.
Mechanical Property Shear Strength Saline soil shear strength affect by the mineral composition of soil, particle size distribution, natural moisture content, compactness and natural structure state, closely related to the salt content. saline soil shear strength - salt content refer with Fig. 2.
Terrain, limate and other factors of Bohai west coast have important effects on the saline soil formation.
The soluble salt content have a greater impact on soil physical properties and mechanical properties, at the same time ,saline soil is the special soil, Under the influence of temperature and moisture, soil salts especially soluble crystalline salt will change, so that the engineering properties of saline soil is very unstable.

The Static Mechanical Property of Concrete at Elevated Temperature Jun-lin Tao 1,a，Li-bo Qin 1,b，Kui Li 1,c，Bin Jia 1,d 1Department of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan, China, 621010 a Junlintao@126.com, bQinlibo@126.com, clikui84@126.com, djiabin216@126.com Key Words: concrete, constitutive model, high temperature, static compression experiment, mechanical properties.
Owing to building may encounter fire in use, in order to protect live and property of people, it's necessary to know the mechanical property of concrete at high temperature.
Research shows that rapid heating is a barrier to research the mechanical property of concrete at high temperature.
The compressive strength is an important index of concrete mechanical property, the compressive strength of concrete under different temperature is shown in table 1.
Due to the complexity of concrete and the effect of mix proportion and other uncertain factors, the specific expression of n is very complex and needs further verification.

When the experiment has been carried out constant and variable technological factors have been determined and the impact of these factors on the values of mechanical properties has been observed: Constant technological factors: · liquid alloy temperature: 700°C · mold temperature: 220°C · plunger pressing velocity: 2,6 m.s-1 · pressing chamber diameter: 70 mm · height of metal rest inside a pressing chamber: 25 mm Variable technological factors: · increase pressure: 10; 15; 20; 25 MPa The impact of the increase pressure cavity on the value of mechanical properties has been verified on experimental samples (fig. 1) cast on a die casting machine with horizontal cold pressing chamber Müller Weingarten 600.
Fig. 4 to Fig. 6 represent individual shapes of relations between selected mechanical properties and studied casting parameters.
Table 2 Reached results of studied mechanical properties Studied technological casting parameters Studied mechanical properties measured values Permanent deformation „s“ [mm] Porosity „f“ [%] Hardness „HB“ Increase pressure [MPa] No.
The casts made under higher pressure during hardening present better mechanical properties with the lowest porosity proportional rate.
Pasko: Influence of technological factors of die casting on mechanical properties of castings from silumin, Lecture Notes in Electrical Engineering, Vol. 240, 2013, p. 713-722 [4] P.

Investigation on Twist of Asymmetric Flanging of Wheel Cowling Tail of Fender and Its Influencing Factors J.P.
Material Properties.
The Influence of Processing Factors on the Distortion.
So the ratios of various factors, which affect the twist angle (θ), are focused instead of themselves when the investigation on θ is conducted.
Conclusions An asymmetry flanging model is built and twist of wheel cowling tail of the fender along with the influencing factors are investigated by mechanical analysis methods and FEM.

In this study, it was demonstrated how second phases with small amount, which are hardly detected by XRD analysis, affect grain boundary dissolution and related mechanical properties of HA.
Following certain period of exposure to the distilled water, the surface dissolution initiated at grain boundaries and particle loosening, subsequently resulting in decrease in mechanical properties of HA.
However, the mechanical properties like fracture toughness of HA ceramics can be drastically decreased by body fluid causing particle loosening and microstructural degradation of materials when implanted in body [3,6-8].
It has been known that there are factors controlling the biological behavior of calcium phosphate materials such as the physical characteristics, chemical composition and crystal structures [9,10].
Conclusions This study has focused on the dissolution behavior of hydroxyapatite affected by grain boundary structure and crystal orientation.

The damage factor can not only change the cohesive zone bonding strength but also affect the energies of separation.
It can affect not only on the maximal strength but also interfacial stiffness.
When the temperature and humidity is the bonding interfacial major damage factors, the interfacial damage factor Hλ is relation to the duration.
The constitutive properties of the bonding interface can be determined through the cohesive zone damage models by the parametersφ, δ, andλ.
Fig. 2 demonstrated the effects the damage factors that can impact not only the initial bonding energy but also the bonding strengths.

Test methods of varied properties Damping property Damping property was measured by a test system of cantilever beam [5].
Mechanical properties of test Tensile-strength, stress at definite elongation 100% and maximum elongation were measured according to the standard of GB /T 528—1998[6].
There were four main factors that could affect the property, namely EPDM/PVC (A), Glass fiber (B), HAF (carbon black) (C), CPE (D) from scientific or technical literature.
The purpose was to obtain the optimum formula and main influence factors.
The results were showed in Table. 4 Table. 4 Range analysis of mechanical properties Conclusion By the orthogonal experiments, the order of effect factors and optimum formula were acquired and the reliability of results was verified based on the analysis of data.

The dispersion form is actually the one of the factor that will affect the final performance of the nanocomposite.
In present report, mechanical properties of HDPE/EVA/MMT/EFB fibers nanohybrid biocomposite have been studied. 2.
The screw rotation speed in extrusion also affected the flexural properties as reported by B.Mano et, al. [18] where the flexural stress decreased with increasing the screw rotation speed.
Carbon nanotube-polymer composites: Chemistry, processing, mechanical and electrical properties.
Phase sturucture and mechanical properties of ternary polypropylene/elastomer/nano-CaCO3 composite.

Excellent combination of mechanical properties makes bainitic steels very attractive for commercial application.
Fig. 1: Electron micrographs of (a) upper bainite in martensitic matrix, (b) lower bainite in martensitic matrix [1] Factors such as alloying content, the transformation temperature and the related morphology of bainite strongly influence the mechanical properties [2].
Fig. 6 shows examples of reached mechanical properties of different alloying concepts.
Caballero et al. [14] described mechanical properties of those bainitic steels and stated the following tensile properties.
Fig. 9: Mechanical properties of bainitic steels with residual austenite (RA) developed at Institute of Metal Forming and compared with steels (C45 and DP600) The mechanical properties of bainitic steels cover a wide spectrum.